Disclosed are an adjustment method of an lcd (Liquid Crystal Display) overdrive voltage and the device. The adjustment method comprises steps below: locating a transistor at a position capable of sensing a temperature of an lcd panel; providing a constant current source to a drain of the transistor and a conducting voltage to the transistor, and a voltage difference between a source and a gate changing according to a temperature changing of the lcd panel; receiving voltages of the source and the gate of the transistor to calculate a voltage difference therebetween and outputting an amplified value of the voltage difference by an error amplifier; receiving the amplified value of the voltage difference and outputting corresponding binary signals by an analog to digital converter; providing a selector storing a plurality of overdrive voltages for selecting different overdrive voltages according to the different binary signals to adjust the lcd overdrive voltage.
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13. An adjustment method of an lcd (Liquid Crystal Display) overdrive voltage, wherein the adjustment method comprises steps of:
locating a transistor on an lcd panel;
applying a voltage difference between a source and a gate of the transistor to change according to the temperature change of the lcd panel;
receiving voltages of the source and the gate of the transistor and outputting a voltage difference thereof by an error calculator;
receiving the voltage difference and outputting corresponding binary signals by an analog to digital converter;
providing a selector storing a plurality of overdrive voltages, selecting a corresponding overdrive voltage according to the binary signals to adjust the lcd overdrive voltage; and
utilizing different overdrive voltages under different temperature conditions.
3. An adjustment device of an lcd (Liquid Crystal Display) overdrive voltage, wherein the adjustment device comprises:
a transistor, an analog to digital converter, an error calculator and a selector storing a plurality of overdrive voltages, the transistor is located on an lcd panel, and a voltage difference between a source and a gate of the transistor changes according to a temperature change of the lcd panel, the error calculator receives voltages of the source and the gate of the transistor and outputs a voltage difference thereof, the analog to digital converter receives the voltage difference and outputs corresponding binary signals, the selector selects a corresponding overdrive voltage according to the binary signals to adjust the lcd overdrive voltage, and different overdrive voltages are utilized under different temperature conditions.
1. An adjustment method of an lcd (Liquid Crystal Display) overdrive voltage, wherein the adjustment method comprises steps of:
locating a transistor at a position capable of sensing a temperature of an lcd panel;
providing a constant current source to a drain of the transistor and a conducting voltage to the transistor, and a voltage difference between a source and a gate of the transistor changing according to the temperature change of the lcd panel;
receiving voltages of the source and the gate of the transistor to calculate a voltage difference between the source and the gate and outputting an amplified value of the voltage difference by an error amplifier;
receiving the amplified value of the voltage difference and outputting corresponding binary signals by an analog to digital converter;
providing a selector of storing a plurality of overdrive voltages, and the selector selecting different overdrive voltages according to the different binary signals to adjust the lcd overdrive voltage; and
utilizing different overdrive voltages under different temperature conditions.
2. The adjustment method of the lcd overdrive voltage of
4. The adjustment device of the lcd overdrive voltage of
5. The adjustment device of the lcd overdrive voltage of
6. The adjustment device of the lcd overdrive voltage of
7. The adjustment device of the lcd overdrive voltage of
8. The adjustment device of the lcd overdrive voltage of
9. The adjustment device of the lcd overdrive voltage of
10. The adjustment device of the lcd overdrive voltage of
11. The adjustment device of the lcd overdrive voltage of
12. The adjustment device of the lcd overdrive voltage of
14. The adjustment method of the lcd overdrive voltage of
15. The adjustment method of the lcd overdrive voltage of
16. The adjustment method of the lcd overdrive voltage of
providing a constant current source to the drain of the transistor and a conducting voltage to the thin film transistor in the step of applying the voltage difference between the source and the gate of the transistor to change according to the temperature change of the lcd panel.
17. The adjustment method of the lcd overdrive voltage of
a drain receiving a predetermined voltage via a constant current source, and the source receiving a reference voltage, and the gate electrically connecting to the drain, and the relation of the predetermined voltage and the reference voltage satisfying a conducting condition of the thin film transistor in the step of applying the voltage difference between the source and the gate of the transistor to change according to the temperature change of the lcd panel.
18. The adjustment method of the lcd overdrive voltage of
amplifying the voltage difference between the source and the gate outputted by the error calculator and outputting the amplified value of the voltage difference to the analog to digital converter, and the analog to digital converter outputs the corresponding binary signals according to the amplified value of the voltage difference.
19. The adjustment method of the lcd overdrive voltage of
locating the thin film transistor at a position which the temperature thereof capable of representing an average temperature of the lcd panel in the step of locating the thin film transistor on the lcd panel.
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1. Field of the Invention
The present invention generally relates to an LCD (Liquid Crystal Display) manufacture field, and more particularly to an adjustment method of LCD overdrive voltage and device thereof.
2. Description of Prior Art
The viscosity factor of the liquid crystal changes each time as a rise or a decrease occurs in the temperature of the LCD panel. Accordingly, the response speed of the liquid crystal also changes. For improving the response speed problem, many solutions have been proposed in prior arts. One of the solutions is to adjust the overdrive voltage of the liquid crystal in accordance with the temperature change to neutralize the response speed change of the liquid crystal. However, the temperature of the LCD panel has to be confirmed for adjusting the overdrive voltage accurately. It is a burning question in prior arts that how to obtain the temperature of the LCD panel accurately in real time.
Accordingly, what is needed is an adjustment method of LCD overdrive voltage and device thereof for rapidly and accurately sensing the temperature of the LCD panel and controlling the LCD overdrive voltage according to the temperature hereby.
An exemplary adjustment method of LCD (Liquid Crystal Display) overdrive voltage comprises steps below: locating a transistor at a position capable of sensing a temperature of an LCD panel; providing a constant current source to a drain of the transistor and a conducting voltage to the transistor, and a voltage difference between a source and a gate changing according to a temperature changing of the LCD panel; receiving voltages of the source and the gate of the transistor to calculate a voltage difference therebetween and outputting an amplified value of the voltage difference by an error amplifier; receiving the amplified value of the voltage difference and outputting corresponding binary signals by an analog to digital converter; providing a selector storing a plurality of overdrive voltages for selecting different overdrive voltages according to the different binary signals to adjust the LCD overdrive voltage.
An exemplary adjustment device of LCD overdrive voltage comprising a transistor, a analog to digital converter, an error calculator and a selector storing a plurality of overdrive voltages. The transistor is located on an LCD panel, and a voltage difference between a source and a gate of the transistor changes according to a temperature change of the LCD panel. The error calculator receives voltages of the source and the gate of the transistor and outputs a voltage difference thereof. The analog to digital converter receives the voltage difference and outputs corresponding binary signals. The selector selects a corresponding overdrive voltage according to the binary signals to adjust the LCD overdrive voltage.
An exemplary adjustment method of LCD overdrive voltage comprises steps below: locating a transistor on an LCD panel; applying a voltage difference between a source and a gate of the transistor to change according to the temperature change of the LCD panel; receiving voltages of the source and the gate of the transistor and outputting a voltage difference thereof by an error calculator; receiving the voltage difference and outputting corresponding binary signals by an analog to digital converter; providing a selector storing a plurality of overdrive voltages, selecting a corresponding overdrive voltage according to the binary signals to adjust the LCD overdrive voltage.
Other novel features and advantages will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, all the views are schematic.
Reference will now be made to the drawings to describe the present invention in detail. For a better understanding the objective, characteristics and benefits of the present invention, preferable embodiments are illustrated in accordance with the attached figures for further explanation. The specification of the present invention provides kinds of embodiments to explain the technical characteristics of the different implementations of the present invention. The locations of the respective elements in the embodiments are for clearly explaining the content of the present invention but not limitations thereto. Same grades used for indicating elements in the different embodiments are simplifying the explanation but not mentioning the relevance between the different embodiments.
The selector 13 stores a plurality of overdrive voltages (OD1, OD2, . . . , ODn). The overdrive is that the LCD is driven by different overdrive voltages OD1, OD2, . . . , ODn according to different response times of the LCD to obtain an ideal display effect. Because the effect of the temperature to the LCD also needs to be adjusted by the overdrive voltage, different overdrive voltages should be utilized under different temperature conditions.
The foregoing thin film transistor 11 can be either a N-type thin film transistor or a P-type thin film transistor, as long as a relation between the predetermined voltage V1 and the reference voltage V2 satisfies a conducting condition of the thin film transistor 11.
Please refer to the device in
Please refer to Step 21, locating the thin film transistor 11 on the LCD panel 10. In this step, the LCD panel 10 can be any common arbitrary LCD panel. If the temperature distribution of the LCD panel 10 is average, the thin film transistor 11 can be located on an arbitrary position on the LCD panel 10; if the temperature distribution of the LCD panel 10 is not average, a position capable of sensing an average temperature of the LCD panel 10 can be selected on actual demands.
Please refer to Step 22, applying a voltage difference between the gate G and the source S of the thin film transistor 11 to change according to the temperature change of the LCD panel. In this step, the drain D of the thin film transistor 11 receives the predetermined voltage V1 via the constant current source 15. The source S receives a reference voltage V2 and the gate G is electrically connected to the drain D. The relation of the foregoing predetermined voltage V1 and the reference voltage V2 satisfies a conducting condition of the thin film transistor 11. In the thin film transistor 11, the voltage Vgs between the source S and the gate G is a function of temperature and can be expressed as: Vgs=Vgs0+aT. The Vgs0 is a voltage between the source S and the gate G at the room temperature; a is a temperature coefficient of the voltage between the source S and the gate G. Basing on the formula ΔVgs=a·ΔT, thereby, the voltage difference change ΔVgs between the source S and the gate G of the thin film transistor 11 due to the temperature change ΔT of the LCD panel 10 can be sensed by the thin film transistor 11 and obtained. In other words, the voltage difference change ΔVgs between the source S and the gate G of the thin film transistor 11 changes according to the temperature change of the LCD panel 10.
Step 23, the error calculator 19 receives the voltages of the gate G and the source S of the thin film transistor 11 and outputs an amplified voltage difference of the gate G and the source S. The foregoing variable voltage input end and the reference voltage input end of the error amplifier 19 receive the voltages of the gate G and the source S of the thin film transistor 11 respectively. The error amplifier 19 outputs the amplified voltage reference of the gate G and the source S.
Step 24, the analog to digital converter 12 receives the foregoing amplified voltage difference outputted by the error amplifier 19 and then outputs corresponding binary signals.
Step 25, the selector 13 selects a corresponding overdrive voltages according to the binary signals outputted by the analog to digital converter 12 for selecting the overdrive voltage for the LCD and adjusting the LCD overdrive voltage.
The aforementioned device and method can reveal the temperature change of the LCD panel 10 in formed by the voltage change of the gate of the thin film transistor 11 with locating the thin film transistor 11 on the LCD panel 10. Therefore, the overdrive voltages can be selected according to the voltage change of the gate of the thin film transistor 11. The test method is simple and quick. Accordingly, the temperature change of the LCD panel 10 can be revealed for adjusting the LCD overdrive voltage.
The aforementioned is merely the preferable embodiment of the present invention. The adjustment method of LCD overdrive voltage and the device thereof are not limited to the aforementioned embodiment. For example, the error amplifier 19 can be merely a error calculator as long as the accuracy of the analog to digital converter 12 can satisfy the corresponding binary signals of the voltage difference output of the gate G and the source S of the thin film transistor 11. The thin film transistor 11 also can be replaced with other transistors, such as a triode.
By locating the thin film transistor 11 on the LCD panel 10 with the aforesaid adjustment device, adjustment method and with testing the gate voltage change of representing the temperature of the LCD panel 10, the test method is simple and quick. Therefore, the temperature of the LCD panel 10 can be rapidly and accurately obtained.
As is understood by a person skilled in the art, the foregoing preferred embodiments of the present invention are illustrative rather than limiting of the present invention. It is intended that they cover various modifications and similar arrangements be included within the spirit and scope of the appended claims, the scope of which should be accorded the broadest interpretation so as to encompass all such modifications and similar structure.
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